Electrical insulator.



T. SCULLY.

ELECTRICAL INSULATOR. APPUCATION FILED MAR.2o,191

Patented Feb. 13, 1917.

'fizvanto 7- d3 ltiarne illustrate the invention UNITED STATES Q'Jl FICE.

THOMAS SCULLY, 3133i)? 93,5 1,

ELECTRICAL INS '1';

T 0 all whom it may concern:

Be it known that I, TiioMAs SCULLY. o citizen of the United States, and resident of New York, in the county oil Lew York and State of New York, have invented rertain new and useful Improvements in Electrical Insulators, of which the following a specification.

The invention relates to electrical ins-ulators for high or low voltages and more particularly to SO-Cil.ll8l strain insulators, that is to say, insulators in which the mate rial is held under con'ipression by two looped conductors whose loops are interlinked but spaced apart by means of the insulator to avoid contact with each oil 1 said loops being usually helrl in planes at angles to each other to secure the maximum spacing.

The invention has for its object to provide an insulator of this type which shail be me chanieally strong. though small enough at high Voltages for eoi'niui rciul purposes, and be readily constructed (l at not too great an expense.

A further object of the invention is to provide an insulator in which the oreepas'e surface is equal in all directions between the respective conductors and Which insulator is so constructed, Furthermore, that it will readily shed. rain eno u'ioisture anti prevent the same tromsettling or oolleetii there notwithstanding any position which the sulator may assume.

In the areompanying ilrawin whirh the improved insulator views.

Referring to the glirmvings. more partueularl Fi s. 1 to 4 1i and 12 ilesivnate the y b I 5 1 I? conductors which are adapteu to we loopeo. i a as shown, enough the insulator. the lattei being preferably constructed in the form 01: a parallelepiped in which two pairs oi suitable longitudinal gulcle grooves 13 and 1% resnectively are provided in the sorter-s Specification. of Letters Retort.

Fatentetl. Feb. 13, 1917.

0 1815. Serial No. 15.59"].

thereof for said conductors as W 3ll as holes l5 and 16 extending therethrough at right angles the conductor grooves. The

grooves are constructed to slope from substantially the middle of the insulator to- \\'-.ir(l each end to more positively insure the shedding of rain and moisture. The amount of insulating material. included between the holes in anal 1G is sui'lieient to provin'le the necess- -y mechanical strengthto resist the compressive forces up when the couihirtors are in service and placed under stress.

In order to provide ample ereepage surface between the two conductors, raised barriers li" anal 18 are constructerlv to *ollow the zspective pairs of groov s 13 and 1% from e corresponding enos oi the insulator longitudinally inwurrlly to the holes 15 and 16 therethrough. This. together with the millitional surface hereinafter described, Will ofiforzi suuloient ereeoage surface laterall lJe tween the (:onrlui'itors to prevent flushover even during a rain or a sleet storm. The angle or". inclin tion of groov i3 and 14 outwaw y and lilfififilli from in eldlt; of the in.- ulator., forth ore, .vili serve to cause the insulutor to sherl rain or moisture and is such. also, as to follow the natural hight of the conductors, thus minimizing stress tron) t source.

in emier to coin l 1 oreepeg'o surf: ce over the enils oi the ill ulator as well as over the siiles thaw-eel. a r or llllQG 20 is eonstruei-eil to extend the entire outer rim 0? the insulator except a i the By suitably m'oportioiiing this barrier, the (listanee l' e'i;\ve-' u two conductors may he mode the some at all points or o soili- "utly great to prevent flasher ill; the

.. i th ins' r is i lrsiggnerl.

anal sneiirling rein or pitched for tl'iis 3 being suitably ".4, v ustiateo in i igs. o

central burr.

respective 6011i the respective surrounding the 3 0 rit;

end 33., but are con tinned entirely YQl'iliCl the some to ti eby the encl ereepnge surface. Furt'ier- 'l ,J more. see. one soles eel; it- 1x1 mt assist in tapered inwardly from the outer surfaces, are provided through the insulator beyond the turn of the said barriers 30 and 31 and in substantially the planes of the respective conductors. The grooves 36 and 37, which are formed between the central barriers 30, 31 and the outer barrier or ridge 38 are pitched not only outwardly substantially from the middle of the insulator but also inwardly toward the holes 34 and This affords a natural shedding surface for rain or moisture which will, therefore, drain through the said holes notwithstanding any position in which the insulator may be placed.

1 claim 1. A strain insulatoracalpted to receive two interlocking conductors at right angles to each other, said insulator being provided with two barriers following each conductor, and a barrier following substantially the edge ol the insulator except at the ends thereof at which the said conductors leave the same. a

2. A strain insulator adapted to receive two interlocking conductors at right angles to each other, said insulator being provided with central barriers extending parallel to the said conductors upon either side thereof, and further barriers extending parallel to said first-nanied barriers at either side thereof and transversely thereto beyond the inner ends of said barriers.

3. A strain insulator adapted to receive two interlocking conductors at right angles to each other, said insulator-being provided with two barriers following each conductor and continued around the same, and a barrier following substantially the edge of the insulator except at the ends thereof at which the said conductors leave the same,

4. A strain insulator adapted to receive two interlocking conductors at rightangles to each other, said insulator being provided with two barriers :l'ollowing each conductor and continued around the same, and a barrier following substantially the edge of the insulator except at the ends thereof at which the said conductors leave the same, said insulator being further provided with a drain hole between the, inner end of each of the wrench central barriers and the corresponding transverse barrier.

5. A strain insulator adapted to receive two interlocking conductors at right angles to each other, said insulator being provided with central barriers extending parallel to the said conductors upon either side thereof, and further barriers extending parallel to said first-named barriers at either side thereof and t'ansversely thereto beyond the inner ends of said barriers, the grooves formed between the said central barriers and the said additional barriers sloping substantially from the middle of the insulator out- 'ardly and inwardly.

(ii A strain insulator adapted to receive two interlocking conductors at right angles to each other, said insulator being provided with two barriers following each conductor and continued around the same, and a barrier tollmving substantially the edge of the insulator except at the ends thereof at which the said conductors leave the same, said insulator being further provided with a drain hole between the inner end of each of the central barriers and the corresponding transverse barrier and the grooves formed between the said centralbarriers and the said additional barriers sloping substantially from the middle of the insulator outwardly to the open end of the insulator and iiiwardly toward the said drain openings at the closed ends.

7. A strain insulator adapted to receive two interlocking conductors at right angles to each other, said insulator being provided with ,guide grooves in its surface and with holes through the said insulator to receive the bight oi. the respective conductors, said guide grooves and holes being located substantially at right angles to each other, the said insulator being further provided with two barriers tollowinpeach conductor, and a barrier following substantially the edge of the insulator except at the ends thereof at which the said conductors leave the same.

Signed at New .Yorlr, in the county of New York, and State of New York, this 18th day of March, A. D. 1915.

rnonas soULLY. 

